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Basis Of Presentation Basis of Presentation (Narrative) (Details) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 17, 2020 USD ($) | Aug. 01, 2019 USD ($) | Jul. 02, 2018 USD ($) | Dec. 31, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2020 segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating segments |  |  |  | 3 |  | 3 |  |
Cost of acquisitions, net of cash acquired |  |  |  |  | $ 339.4 |  | $ 41.3 | $ 38.0
PowerA |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, net of working capital adjustment | $ 340.0 |  |  |  |  |  |  |
Contingent consideration amount | $ 55.0 |  |  |  |  |  |  |
Foroni Acquisition |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, net of working capital adjustment |  | $ 41.5 |  |  |  |  |  |
Cost of acquisitions, net of cash acquired |  | 41.5 |  |  |  |  |  |
Debt |  | $ 7.6 |  |  |  |  |  |
GOBA Acquisition |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, net of working capital adjustment |  |  | $ 39.1 |  |  |  |  |
Cost of acquisitions, net of cash acquired |  |  | $ 37.2 |  |  |  |  |

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